Demographic changes are one of the factors determining labour market changes. This article presents the results of the analysis of the influence of demographic processes on the Town of Zamość and Zamość County labour market changes. As regards labour market changes, the predicted decrease in the number of people who are the most active professionally, that is those aged 20-59, is very important. In the year 2020, the analysed group of people will comprise 10 470 persons less (10.4% less) than in 2010. The decrease in the number of people aged 20-59 will be close to the number of unemployed persons now registered. Thus, the predicted demographic changes will cause a significant reduction of the pressure on the labour market. The number of graduates and young people looking for their first job should fall. Even though now it may seem improbable, if the overall economic situation improves in the following years, especially by the end of this decade, it may be difficult to find workers.